Expanding in-person learning in public schools from the current 1,604 students has a new target date of March 1, the district superintendent told School Committee members Tuesday.

Superintendent Kenneth Salim will resign from the Cambridge Public Schools effective June 30, he said in a letter sent to the school community Tuesday. The departure would come two years before his contract is due to expire.

The December death of school district staff member James “Jimmy” Ravanis moved the risk of Covid-19 transmission from an abstraction to reality for some this week, adding weight to passage of a new method of deciding in-person classes versus remote learning as the pandemic continues.

Cambridge Public Schools enter 2021 with debate and decisions that will reshape the school year. A change in how to decide between in-person or remote learning will be discussed and voted on Tuesday.

All Cambridge Public Schools classes will stay remote until at least Jan. 11, though current guidelines would allow in-person learning to resume next week.

The School Committee will discuss or vote on three key changes to its Covid-19 response at its special meeting Tuesday: to reduce social distancing requirements; change quarantine rules; and reassess how Covid-19 metrics are used to gauge the safety of in-person learning.

Cambridge Public Schools will stay in remote learning until at least Jan. 4, superintendent Kenneth Salim said. Many parents have expressed despair, with one pediatrician worrying about a “bona fide public health crisis regarding our children’s mental health.”

The closing of Cambridge Public Schools to in-person learning that begins Thursday should be canceled through the declaration of a public health emergency, city councillor Patty Nolan told city staff at a Monday meeting.

In-person learning at public schools will resume when coronavirus thresholds dip again, but the shift to all-remote learning will continue for at least seven consecutive days through Dec. 16, superintendent Kenneth Salim said Sunday.

Contract tracing efforts show it’s highly likely two children contracted Covid-19 from adults while at in-person classes in Cambridge Public Schools, city councillors learned Monday. The district will offer testing to more students as it prepares to expand in-person classes.